1. Women who have met American College of Rheumatology (1990) criteria for the diagnosis of FM (Wolfe, Smythe et al. 1990) for at least 1 year. To fulfill the criteria for FM established by the American College of Rheumatology in 1990, an individual must have both chronic widespread pain involving all four quadrants of the body (and the axial skeleton), and the presence of 11 of 18 pre-defined "tender points" on examination. A positive tender point is identified when an individual complains of pain when approximately four kilograms of pressure is applied to one of these points by an examiner